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In this paper,a kind of three-dimensional analysis technology for characterizing non-metallic inclusions in steel was clearly elaborated.It is an electron microscopy observation,namely the non-aqueous electrolysis extraction method with a settled coulometer.In the research,the extraction effects of non-metallic inclusions in different electrolysis systems were studied,and it was concluded that alkalescent 2％ TEA non-aqueous electrolyte was applicable for extracting most of non-metallic inclusion particles in steel.And then,in order to ensure the microscopic characterization and statistical calculation of inclusion particles,some electrolysis parameters should be confirmed,such as the size of the sample,control of the electrolysis mass,electric current,etc.Furthermore,for preventing the disturbance of carbides and presenting clear three-dimensional appearance by microscopic characterization,magnetic separation was utilized to separate the inclusion particles from carbides,which was useful for getting more veracious types,particle sizes and chemical composition of inclusions.Moreover,through calculation of quantity and particle size of inclusions in continuous determinate fields,the total quantity per unit volume or area and the particle size distribution of inclusions could be acquired by conversion with electrolysis loss.Besides,the comparison between this method and traditional quantitative metallography was also discussed,and finally,a conclusion was drawn that both of them have respectively applications in characterizing inclusions.